public function start()
 {
     parent::start();
     // This fake widget is inserted to make the system believe that there is
     // at least one alternative with a widget that can be "applied" (and, thus,
     // the Apply and Clean buttons in the progress of the experiment make
     // sense).
     $aux = NelioABWidgetExpAdminController::get_widgets_in_experiments();
     NelioABWidgetExpAdminController::link_widget_to_experiment('nelioab-fake-' . $this->get_id(), $this->get_id(), 'no-alternative', $aux);
     NelioABWidgetExpAdminController::set_widgets_in_experiments($aux);
 }